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| author | Roland Dreier <roland@purestorage.com> | 2013-06-05 09:54:17 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-06-27 10:39:09 -0700 |
| commit | f9ed15641859740ad111e2e1a4fff1ae7c592e87 (patch) | |
| tree | 554ec644ba9c9aa691967164f19b550f622be8c8 | |
| parent | bbf322be24a8e42b7d7fb88db9503ec65845b3a5 (diff) | |
| download | lwn-f9ed15641859740ad111e2e1a4fff1ae7c592e87.tar.gz lwn-f9ed15641859740ad111e2e1a4fff1ae7c592e87.zip | |
tcm_qla2xxx: Fix residual for underrun commands that fail
commit b5aff3d2747bea08b386edd070941a45611ffe51 upstream.
Suppose an initiator sends a DATA IN command with an allocation length
shorter than the FC transfer length -- we get a target message like
TARGET_CORE[qla2xxx]: Expected Transfer Length: 256 does not match SCSI CDB Length: 0 for SAM Opcode: 0x12
In that case, the target core adjusts the data_length and sets
se_cmd->residual_count for the underrun. But now suppose that command
fails and we end up in tcm_qla2xxx_queue_status() -- that function
unconditionally overwrites residual_count with the already adjusted
data_length, and the initiator will burp with a message like
qla2xxx [0000:00:06.0]-301d:0: Dropped frame(s) detected (0x100 of 0x100 bytes).
Fix this by adding on to the existing underflow residual count instead.
Signed-off-by: Roland Dreier <roland@purestorage.com>
Cc: Giridhar Malavali <giridhar.malavali@qlogic.com>
Cc: Chad Dupuis <chad.dupuis@qlogic.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/scsi/qla2xxx/tcm_qla2xxx.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/scsi/qla2xxx/tcm_qla2xxx.c b/drivers/scsi/qla2xxx/tcm_qla2xxx.c index d182c96e17ea..0c58bd1630bd 100644 --- a/drivers/scsi/qla2xxx/tcm_qla2xxx.c +++ b/drivers/scsi/qla2xxx/tcm_qla2xxx.c @@ -688,8 +688,12 @@ static int tcm_qla2xxx_queue_status(struct se_cmd *se_cmd) * For FCP_READ with CHECK_CONDITION status, clear cmd->bufflen * for qla_tgt_xmit_response LLD code */ + if (se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) { + se_cmd->se_cmd_flags &= ~SCF_OVERFLOW_BIT; + se_cmd->residual_count = 0; + } se_cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT; - se_cmd->residual_count = se_cmd->data_length; + se_cmd->residual_count += se_cmd->data_length; cmd->bufflen = 0; } |